Method and Apparatus for Transmitting and Receiving Signal

1. A transmission method comprising: performing modulation by a modulator on a first input signal and a second input signal to be transmitted based on symbol mapping; adjusting a phase value of the second modulated input signal; performing angle modulation on the first input signal; performing angle modulation on the second input signal having the adjusted phase value; and transmitting by a transmission unit the angle-modulated first and second input signals, wherein in the performing of angle modulation on the first input signal and in the performing angle modulation on the second input signal, angle modulation is performed by converting phase values which are phase information of the corresponding input signals into cos(phase value)+j.times.sin(phase value), and wherein the obtaining of the phase information comprises: calculating a difference between the first input signal and the second input signal based on the phase difference value between the first input signal and the second input signal and the phase information being based on the phase difference.

2. The method of claim 1 , further comprising scaling phase values of the first modulated input signal and the second modulated input signal such that they are positioned within a pre-set range, after the modulation is performed.

3. The method of claim 2 , wherein in the adjusting of the phase value of the second input signal, a scaled phase value of the second input signal is adjusted, and in the performing of angle modulation on the first input signal, angle modulation is performed on the scaled first input signal.

4. The method of claim 2 , wherein in the positioning, the phase values are scaled such that phase values of the first input signal and the second input signal are greater than −π/4 and smaller than π/4.

5. The method of claim 1 , further comprising adjusting a phase of the modulated first input signal, and wherein, in the performing of angle modulation on the first input signal, angle modulation is performed on the first input signal having the adjusted phase value.

6. The method of claim 5 , wherein in the adjusting of the phase value of the first input signal and in the adjusting of the phase value of the second input signal, the phase values of the corresponding input signals are adjusted based on phase adjustment values making the phase difference between the phase value of the first input signal and the phase value of the second input signal a pre-set value.

7. The method of claim 6 , wherein when a vector value of the adjusted phase values of the first input signal is Cθ1(T) and a vector value of the adjusted phase values of the second input signal is Cθ2(T), the following conditions are satisfied: C ⁢ ⁢ Θ ⁢ ⁢ 1 ⁢ ( T ) = S ⁢ ⁢ Θ ⁢ ⁢ 1 ⁢ ( T ) + Phase ⁢ ⁢ adjusted ⁢ ⁢ value 1 C ⁢ ⁢ Θ ⁢ ⁢ 2 ⁢ ( T ) = S ⁢ ⁢ Θ ⁢ ⁢ 2 ⁢ ( T ) + Phase ⁢ ⁢ adjusted ⁢ ⁢ value 2 Phase ⁢ ⁢ adjusted ⁢ ⁢ value 1 - Phase ⁢ ⁢ adjusted ⁢ ⁢ value 2 = ± π 2 .

8. A transmission apparatus comprising: a first transmission processing unit configured to perform modulation on a first input signal to be transmitted based on symbol mapping, and perform angle modulation on the modulated first input signal; a second transmission processing unit configured to perform modulation on a second input signal to be transmitted based on symbol mapping, adjust a phase of the modulated second input signal, and perform angle modulation on the phase-adjusted second input signal; and a transmission unit configured to transmit the angle-modulated first and second input signals, wherein the first transmission processing unit comprises: a signal conversion unit configured to convert the first input signal into a parallel signal; a symbol mapping unit configured to perform symbol mapping on the first input signal in the parallel form; an inverse fast Fourier transform (IFFT) unit configured to perform IFFT on the symbol-mapped first input signal; a scaling unit configured to perform scaling such that phase values as phase information corresponding to the IFFT-transformed first input signal are positioned within a pre-set range; and an angle modulation unit configured to angle-modulate the scaled first input signal, wherein the first transmission processing unit further comprises a phase adjusting unit configured to adjust phases of the phase values corresponding to the scaled first input signal, wherein the angle modulation unit angle-modulates the phase-adjusted second input signal, and wherein the obtaining of the phase information comprises: calculating a difference between the first input signal and the second input signal based on the phase difference value between the first input signal and the second input signal and the phase information being based on the phase difference.

9. The transmission apparatus of claim 8 , wherein the second transmission processing unit comprises: a signal conversion unit configured to convert the second input signal into a parallel signal; a symbol mapping unit configured to perform symbol mapping on the second input signal in the parallel form; an IFFT unit configured to perform IFFT on the symbol-mapped second input signal; a scaling unit configured to perform scaling such that phase values corresponding to the IFFT-transformed second input signal are positioned within a pre-set range; a phase adjusting unit configured to adjust phases of the phase values corresponding to the scaled second input signal; and an angle modulation unit configured to angle-modulate the phase-adjusted second input signal.

10. The transmission apparatus of claim 8 , wherein the phase adjusting unit of the first transmission processing unit and the phase adjusting unit of the second transmission processing unit adjust the phase values of the corresponding input signals based on phase adjustment values making the phase difference between the phase value of the first input signal and the phase value of the second input signal a pre-set value.

11. The transmission apparatus of claim 8 , wherein the transmission unit comprises: a signal combining unit configured to combine the angle-modulated first input signal and the angle-modulated second input signal to generate a transmission signal; a signal amplifying unit configured to amplify the transmission signal; and a transmission antenna configured to transmit the transmission signal.

12. The transmission apparatus of claim 8 , wherein the transmission unit comprises: a signal amplifying unit configured to amplify the angle-modulated first input signal; a signal amplifying unit configured to amplify the angle-modulated second input signal; a signal combining unit configured to combine the amplified first input signal and second input signal to generate a transmission signal; and a transmission antenna configured to transmit the transmission signal.

13. The transmission apparatus of claim 8 , wherein the transmission unit comprises: a signal amplifying unit configured to amplify the angle-modulated first input signal; a signal amplifying unit configured to amplify the angle-modulated second input signal; a transmission antenna configured to transmit the amplified first input signal; and a transmission antenna configured to transmit the amplified second input signal.

14. A reception method comprising: receiving reception signals, with an angle demodulation unit, as a first angle-modulated input signal and a second angle-modulate input signal from a transmission apparatus; obtaining phase information as phase values of the first input signal and the second input signal before being angle-modulated based on a difference between the first input signal and the second input signal; separating the reception signals into a first reception signal corresponding to the first input signal and a second reception signal corresponding to the second input signal based on the phase information; demodulating, with a first reception processing unit, the first reception signal to obtain data corresponding to the first input signal; and demodulating the second reception signal to obtain data corresponding to the second input signal, wherein the obtaining of the phase information comprises: calculating the difference between the first input signal and the second input signal based on the phase difference value between the first input signal and the second input signal.

15. The method of claim 14 , wherein the obtaining of the phase information in a case that the first input signal and the second input signal are phase-adjusted, angle-modulated, and subsequently transmitted, comprises: a sum of the first input signal and the second input signal, and phase-adjusted values obtained by adjusting the first input signal and the second input signal.

16. The method of claim 14 , wherein in the obtaining of the phase information, the phase information as phase values of the first input signal and the second input signal before being angle-modulated is obtained based on statistical characteristics of respective satellite values constituting the first input signal and the second input signal.

17. A reception apparatus comprising: an angle demodulation unit configured to receive reception signals as an angle-modulated first signal and an angle-modulated second signal from a transmission apparatus, and separate the reception signals into a first reception signal corresponding to the first input signal and a second reception signal corresponding to the second input signal based on phase information as phase values of the first input signal and the second input signal before being angle-modulated; a first reception processing unit configured to demodulate the first reception signal to obtain data corresponding to the first input signal; and a second reception processing unit configured to demodulate the second reception signal to obtain data corresponding to the second input signal, wherein the angle demodulation unit obtains the phase information of the first input signal and the second input signal before being angle-modulated based on a difference between the first input signal and the second input signal based on a phase difference value between the first input signal and the second input signal.

18. The reception apparatus of claim 17 , wherein when the first input signal and the second input signal are phase-adjusted, angle-modulated, and subsequently transmitted, respectively, and the angle demodulation unit obtains the phase information as phase values of the first input signal and the second input signal before being angle-modulated, a sum of the first input signal and the second input signal, and phase-adjusted values obtained by adjusting the first input signal and the second input signal.

19. The reception apparatus of claim 17 , wherein the first reception processing unit and the second reception processing unit, respectively, comprise: a scaling unit configured to scale an input signal by using a modulation index applied from a transmitter; a signal conversion unit configured to convert the scaled signal into a parallel signal; an FFT unit configured to perform FFT on the signal in the parallel form; and a signal demapping unit configured to perform demapping on the FFT-transformed signal to demodulate it to obtain corresponding data.